She
could have shown that she was human , but the world number one Serena
Williams was still at his unstoppable best way she booked a place in the
quarterfinals of Brisbane on Tuesday .The
17 time Grand Slam tennis champion overcame a wobble rare air that brought a
welcome smile to the face of opponent beat German Andrea Petkovic was
cruising to a 6-4, 6-4 second round win at Pat Rafter Arena .Williams , 32, a frustrated figure after unforced errors while blowing the rust in his first game of the new season .But
the defending champion does not know how to react when she broke to the
net in the fifth game of the second set for another winner , only to
completely miss former world number nine floating return Petkovic .Petkovic
- now number 43 - had a good natured laugh, but not much more than
smile and Williams extended its overall winning streak of 19 matches.Williams
booked a quarter- final against ninth seed Dominika Cibulkova , who was
the first to the final eight when toppled 43 years by beating Kimiko
Date- Krumm of Japan 6-3 , 1-6, 6-3.Meanwhile
, former world No. 1 Jelena Jankovic crushed Ukrainian Elina Svitolina
6-1 6-3 to cruise into the quarterfinals of the Brisbane International
on Tuesday .The fourth -seeded Serbian made short work of the world No.45 Svitolina - ranked 37 places lower than Jankovic .The 28- year-old Jankovic remains on course for a semifinal clash with the world No. 2 Victoria Azarenka .
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